no
Some of them are, but not all of them. A parallelogramis a rectangle only if all of its angles are equal.
Square
a rhombus has all equal sides but a parallelagram only has two equal sides.
The answer to this question is a parallelagram
Not necessarily, but it can.
parallelagram
parallelagram
a trapizoid(:? i think!!(::
0 or 4
A rectangle or a square.
parallelagram http://en.wikipedia.org/wiki/Parallelagram well specifically you would be a rectangle which has parallel sides like a square. a parallelogram can be a square or a rectangle because they all have parallel sides but only squares and rectangles have right angles on all sides. parallelograms have congruent sides which require acute and obtuse angles.
yes, when opposite angles and sides are congruent